National Gypsum XP (the "purple" board)


National Gypsum XP paper-faced gypsum board products treated with Sporgard resist mold growth, according to the company. The treatment from Sybgenta has been added to the Gold Bond brand Hi-Abuse XP, Hi-Impact XP, and XP Gypsum Board products, earning them Greenguard certification for indoor air quality.

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